ZFS rpool on Raid-1 SSD's with Over Provisioning

[trendco]

I want to install Proxmox-4 with ZFS/RAID-1 on 2x SSDs.
How can I make it, that Proxmox does not use the whole SSD's and 10% remain empty for Over-Provisioning?

 

[tom]

AFAIK this is not possible, zfs always grabs the whole disk.

 

[trendco]

No, you can also make a GPT Partition and use this instead of the whole Disk.
BTW, when you create a Pool with ZoL this happens automatically in Background, but over the full Disk Size.

But i don't know, how i can do that with Proxmox Installer.

 

[trendco]

For Info, i've done it with the HPA-Method:

https://www.thomas-krenn.com/de/wiki/SSD_Over-Provisioning_mit_hdparm

It can be done also with HDAT2: http://www.hdat2.com

 

[Erk]

Over provisioning is normally done at the filesystem level, not at the volume management. Try using the zfs quotas to tune the behavior the way you want for each zfs dataset.

 

[trendco]

As I know, exactly this works not with ZFS!
The only way would be, to solve this with Partitions, so if you leave a Part of the Disk unpartitioned. But then, you have to create a Pool with Partitions and not with the whole Disk.
But when you work with HPA, you can use the "whole" Disk and you still have OverProvisioning.